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Topic: Iron-sulfur cluster

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Iron-sulfur cluster - Wikipedia, the free encyclopedia The 2 iron, 2 sulfur cluster, consisting of two iron atoms, with two inorganic sulfur atoms found between the irons and acting as bridging ligands. The 3 iron, 4 sulfur cluster, which is a 4 iron, 4 sulfur cluster with one missing iron atom. Iron-sulfur clusters can be involved in oxidation-reduction reactions, or can be involved in catalysis. en.wikipedia.org /wiki/Iron-sulfur_cluster   (207 words)

Mutational analysis of the mitochondrial Rieske iron-sulfur protein of Saccharomyces cerevisiae. III. Import, protease processing, and assembly into the cytochrome bc1 complex of iron-sulfur protein lacking the iron-sulfur cluster. Insertion of the iron-sulfur cluster is not an obligatory prerequisite to processing of the protein to its final size. Either the processing protease cannot distinguish between iron-sulfur protein with or without the iron-sulfur cluster, or insertion of the iron-sulfur cluster occurs after the protein is processed to its mature size, possibly after it is assembled in the cytochrome bc1 complex. We have used site-directed mutagenesis of the Saccharomyces cerevisiae Rieske iron-sulfur protein gene (RIP 1) to convert cysteines 159, 164, 178, and 180 to serines, and to convert histidines 161 and 181 to arginines. www.ihop-net.org /UniPub/iHOP/gp/46145.html   (374 words)

Iron-sulfur protein - Wikipedia, the free encyclopedia Iron-sulfur proteins are proteins characterized by the presence of polymetallic systems (iron-sulfur clusters) containing sulfide ions, in which the iron ions have variable oxidation states. The simplest polymetallic system, [Fe ] cluster, is constituted by two iron ions bridged by two sulfide ions and coordinated by four cysteinyl ligands (in Fe ferredoxins) or by two cysteines and two histidines (in Rieske proteins). Another common polymetallic system, [Fe ] cluster, consists of four iron ions and four sulfide ions placed at the vertices of a cubane-type structure, coordinated by four cysteinyl ligands. en.wikipedia.org /wiki/Iron-sulfur_protein   (369 words)

Encyclopedia article on Iron [EncycloZine] Inorganic iron is also found in the iron-sulfur clusters of many enzymes, such as nitrogenase (Synthesis of ammonia from nitrogen and hydrogen) and hydogenase. Iron is a metal extracted from iron ore, and is hardly ever found in the free (elemental) state. Iron is the most abundant metal, and is believed to be the tenth most abundant element, in the universe. encyclozine.com /Iron   (2343 words)

IscA Mediates Iron Delivery for Assembly of Iron-Sulfur Clusters in IscU under the Limited Accessible Free Iron Conditions -- Ding et al. 279 (36): 37499 -- Journal of Biological Chemistry iron for the IscS-mediated iron-sulfur cluster assembly in IscU. iron for the iron-sulfur cluster assembly in IscU. to the iron-sulfur clusters in IscU, we incubated the iron-loaded www.jbc.org /cgi/content/full/279/36/37499   (4452 words)

Andrew2005abstract.doc Iron sulfur cluster assembly in Saccharomyces cerevisiae involves the scaffold protein Isu, which is a substrate of the Hsp70 Ssq1 and the J-protein Jac1. Therefore, it is proposed that in yeast the iron-sulfur cluster assembly pathway involves several methods of overcompensation. Amy Andrew, Rafal Dutkiewicz, Jaroslaw Marszalek, & Elizabeth Craig Iron-sulfur clusters are essential cofactors in numerous proteins that are involved in diverse cellular processes. www.bact.wisc.edu /Biotech/STUDENT/AmyAndrew/Andrew2005abstract.doc   (263 words)

Dr. Ding - Homepage Throughout evolution, iron-sulfur clusters have become integral parts of diverse cellular functions such as energy conversion, the citrate acid cycle, nitrogen fixation, intracellular iron homeostasis, heme and biotin biosynthesis, DNA synthesis and DNA repair, and regulation of gene expression. Current research is to elucidate the redox reactions by which iron-sulfur clusters are modified by reactive oxygen species and the cellular repair mechanism for the modified iron-sulfur clusters. Among the six proteins (IscS, IscU, IscA, HscB, HscA and Ferredoxin) encoded by the gene cluster iscSUA-hscBA-fdx, IscS is a cysteine desulfurase that catalyzes desulfurization of L-cysteine and provides sulfur for the iron-sulfur cluster assembly in IscU. www.biology.lsu.edu /webfac/hding   (467 words)

Mitochondrial-type iron-sulfur cluster biosynthesis genes (IscS and IscU) in the apicomplexan Cryptosporidium parvum -- LaGier et al. 149 (12): 3519 -- Microbiology Mitochondrial-type iron–sulfur cluster biosynthesis genes (IscS and IscU) in the apicomplexan Cryptosporidium parvum Tachezy, J., Sanchez, L. and Müller, M. Mitochondrial-type iron-sulfur cluster assembly in the amitochondriate eukaryotes Trichomonas vaginalis and Giardia intestinalis, as indicated by the phylogeny of IscS. Mitochondrial-type iron-sulfur cluster biosynthesis genes (IscS and IscU) in the apicomplexan Cryptosporidium parvum -- LaGier et al. mic.sgmjournals.org /cgi/content/full/149/12/3519   (4978 words)

BioMed Central Full text The iron-sulfur cluster assembly genes iscSand iscUof Entamoeba histolyticawere acquired by horizontal gene transfer The identification of genes encoding putative Isc proteins in the genomes of all amitochondrial protists sequenced so far [15-19] suggests that this mitochondrial function might have been retained in all amitochondrial protists and may be a general functional feature of all mitochondrion-derived organelles [12,16,20-22]. The position of Rickettsia prowazekii IscS basal to the eukaryotes suggests that eukaryotic IscS proteins originated from the mitochondrial endosymbiont, since this bacterium is considered to be a close relative to the mitochondrial ancestor. IscS is one of the eight members of the class V subfamily (Fig. www.biomedcentral.com /1471-2148/4/7   (4402 words)

keywords.rdf Protein component of gap junctions which are specialized regions of the plasma membrane formed by a cluster of channels allowing small molecules to diffuse from the cytosol of one cell to that of an adjacent cell. In myoglobin and hemoglobin, one of the coordination positions of iron is occupied by oxygen or other ligands, such as carbon monoxide. Protein involved in the synthesis of heme, an iron atom coordinated to a protoporphyrin IX. www.isb-sib.ch /DEA/2003_2004/tpmodule3/xml/08/keywords.rdf   (14098 words)

Transcription Factor FnrP from Paracoccus denitrificans Contains an Iron-Sulfur Cluster and Is Activated by Anoxia: Identification of Essential Cysteine Residues -- Hutchings et al. 184 (2): 503 -- The Journal of Bacteriology Reconstitution of the [4Fe-4S] cluster in FNR and demonstration of the aerobic anaerobic switch in vitro. Transcription regulation of the nir gene cluster encoding nitrite reductase of Paracoccus denitrificans involves NNR and NirI, a novel type of membrane protein. Anaerobic acquisition of [4Fe-4S] clusters by the inactive FNR(C20S) variant and restoration of activity by second-site amino acid substitutions. jb.asm.org /cgi/content/full/184/2/503   (4107 words)

The Bound Electron Acceptors in Green Sulfur Bacteria: Resolution of the g-Tensor for the FX Iron-Sulfur Cluster in Chlorobium tepidum -- Vassiliev et al. 78 (6): 3160 -- Biophysical Journal Photosynthetic electron-transfer reactions in the green sulfur bacterium Chlorobium vibrioforme--evidence for the functional involvement of iron-sulfur redox centers on the acceptor side of the reaction center. clusters are the sole components that contribute to the spectral Photosynthetic reaction center genes in green sulfur bacteria and in photosystem-1 are related. www.biophysj.org /cgi/content/full/78/6/3160   (5869 words)

Research Resources - Scientific Publications: Wadsworth Center, New York State Department of Health LaGier,M.J., Tachezy,J., Stejskal,F., Kutisova,K., and Keithly,J.S. Mitochondrial-type iron-sulfur cluster biosynthesis genes (IscS and IscU) in the apicomplexan Cryptosporidium parvum. Mathema,B., Bifani,P.J., Driscoll,J. Steinlein,L., Kurepina,N., Moghazeh,S.L., Shashkina,E., Marras,S., Campbell,S., Mangura,B., Shilkret,K., Crawford,J.T., Frothingham,R., and Kreiswirth,B.N. (2002) Identification and evolution of an IS6110 low-copy-number Mycobacterium tuberculosis cluster. (2001) Cluster of tuberculosis cases in North Carolina: possible association with atomizer reuse. www.wadsworth.org /scipubs/infdis.html   (3916 words)

An Iron-Sulfur System This view shows what happens to the iron-sulfur cluster when a few of the surrounding groups are added. Two of the iron atoms on opposite corners are bonded to another sulfur atom, which is part of a cysteine molecule. There are several molecules that have iron and sulfur bonded together in various arrangements. www.stolaf.edu /depts/chemistry/courses/toolkits/121/mo/falk/fes.htm   (197 words)

ISU1 - Mitochondrial functional interactions between frataxin and Isu1p, the iron-sulfur cluster scaffold protein, in Saccharomyces cerevisiae. Depletion of the cysteine desulfurase Nfs1p, the ferredoxin Yah1p or the yeast frataxin homologue Yfh1p by regulated gene expression causes a strong decrease in the de novo synthesis of Fe/S clusters on Isu1p. Hence Ssq1p/Jac1p and Grx5p are required in a step after Fe/S cluster synthesis on Isu1p, for instance in dissociation of preassembled Fe/S clusters from Isu1p and/or their insertion into apoproteins. www.ihop-net.org /UniPub/iHOP/gg/36004.html   (559 words)

OhioLINK ETD: Wu, Shu-Pao Binding of DnaK decreases the rates of forming IscU-Fd complexes (greater than 8-fold) and also causes a minor change on the rates of iron sulfur cluster transfer in IscU-Fd complexes. The rate constants of cluster transfer from native ISA to Fd are shown to be similar to those of cluster transfer from Cys derivatives of ISA. The factors that contribute to cluster transfer efficiency also appear to be similar, including the importance of cluster lability and solvent accessibility. www.ohiolink.edu /etd/view.cgi?osu1078866123   (362 words)

PsaC Subunit of Photosystem I Is Oriented with Iron-Sulfur Cluster FB as the Immediate Electron Donor to Ferredoxin and Flavodoxin -- Vassiliev et al. 74 (4): 2029 -- Biophysical Journal PsaC Subunit of Photosystem I Is Oriented with Iron-Sulfur Cluster FB as the Immediate Electron Donor to Ferredoxin and Flavodoxin -- Vassiliev et al. The protein responsible for center A/B in spinach photosystem I: isolation with iron-sulfur cluster(s) and complete sequence analysis. Active photosynthesis in cyanobacterial mutants with directed modifications in the ligands for two iron-sulfur clusters in the PsaC protein of photosystem I. [Abstract] www.biophysj.org /cgi/content/full/74/4/2029   (4387 words)

Biochem complex, and that the rate of this reaction is extensively influenced by the midpoint potential of the iron-sulfur cluster. Alteration of the midpoint potential and catalytic activity of the Rieske iron-sulfur protein by changes of amino acids forming hydrogen bonds to the iron-sulfur cluster. ABSTRACT The crystal structure of the bovine Rieske iron-sulfur protein indicates a sulfur atom (S-1) of the iron-sulfur cluster and the sulfur atom (S www.biophys.uni-frankfurt.de /link/papers/JBC_1998a.htm   (262 words)

2002 Publications Lytle and N. Pingitore, Jr., "Iron Valence in the Hydration Layer of Obsidian: Characterization by X-ray Absorption Spectroscopy", Microchem. Urbina, J. Cupp-Vickery and L. Vickery, "Preliminary Crystallographic Analysis of the Cysteine Desulfurase IscS from Escherichia coli", Acta Crystallogr. Pingitore, Jr., A. Iglesias, A. Bruce, F. Lytle and G. Wellington, "Valences of Iron and Copper in Coral Skeleton: X-ray Absorption Spectroscopy Analysis", Microchem. www-ssrl.slac.stanford.edu /pubs/2002pubs.html   (9950 words)

The crystal structure of TrxA(CACA): Insights into the formation of a [2Fe-2S] iron-sulfur cluster in an Escherichia coli thioredoxin mutant -- Collet et al. 14 (7): 1863 -- Protein Science The crystal structure of TrxA(CACA): Insights into the formation of a [2Fe-2S] iron-sulfur cluster in an Escherichia coli thioredoxin mutant -- Collet et al. as a dimer in which the iron–sulfur cluster is replaced Articles by Collet, J.-F. Articles by Xu, Z. The crystal structure of TrxA(CACA): Insights into the formation of a [2Fe-2S] iron–sulfur cluster in an Escherichia coli thioredoxin mutant www.proteinscience.org /cgi/content/abstract/14/7/1863   (277 words)

C.jejuni Pfam match to entry PF00037 fer4, 4Fe-4S ferredoxins and related iron-sulfur cluster binding domains., score 15.40, E-value 0.0034 Pfam match to entry PF00037 fer4, 4Fe-4S ferredoxins and related iron-sulfur cluster binding domains., score 8.20, E-value 0.4 Pfam match to entry PF00037 fer4, 4Fe-4S ferredoxins and related iron-sulfur cluster binding domains., score 7.10, E-value 0.85 www.sanger.ac.uk /Projects/C_jejuni/CDS/Cj0781.shtml   (167 words)

Find in a Library: Biological iron sulfur cluster assembly Find in a Library: Biological iron sulfur cluster assembly WorldCat is provided by OCLC Online Computer Library Center, Inc. on behalf of its member libraries. To find this item in a library, enter a postal code, state, province, or country in the field above. worldcatlibraries.org /wcpa/ow/6df70ec9d7853ba9a19afeb4da09e526.html   (44 words)

FS4 (From: 1ISU.PDB; Formula: FE4 S4; resolution. 1.5 A.; Name(s): iron/sulfur cluster; fe4-s4 cluster) COMPND FS4 IRON/SULFUR CLUSTER; FE4-S4 CLUSTER REMARK FS4 Extracted from PDB file 1isu.pdb REMARK FS4 Formula FE4 S4 REMARK FS4 Nr of non-hydrogen atoms 8 REMARK FS4 Residue type FS4 REMARK FS4 Residue name 488 REMARK FS4 Original residue name (for O) $A63 REMARK FS4 RESOLUTION. assuming Sulfur NONBonded SX7 0.0430 3.3676 0.0430 3.3676 ! assuming Sulfur NONBonded SX6 0.0430 3.3676 0.0430 3.3676 ! atb.csb.yale.edu /xplor-info/hetero/FS4.html   (1648 words)

HIC-Up files for compound FS4 iron/sulfur cluster; fs4-cubane iron sulfur cluster; fs4-cubane iron sulfur cluster; fs4 -cubane iron sulfur cluster; fe4-s4 cluster; fs4 iron/sulfur cluster HIC-Up files for compound FS4 iron/sulfur cluster; fs4-cubane iron sulfur cluster; fs4-cubane iron sulfur cluster; fs4 -cubane iron sulfur cluster; fe4-s4 cluster; fs4 iron/sulfur cluster This page is part of the HIC-Up site (Hetero-compound Information Centre - Uppsala). xray.bmc.uu.se /hicup/FS4   (241 words)

PYROBASE -- www.cmbi.ru.nl/pyrobase -- B.E. Dutilh 4Fe-4S iron sulfur cluster binding proteins, NifH/frxC family (fer4_NifH) 4Fe-4S iron sulfur cluster binding proteins, NifH/frxC family ATPases involved in chromosome partitioning [D] Orthologous groups with genomic links to COG0455 (to analyse the genomic context click the STRING button below): www.cmbi.kun.nl /pyrobase/cgi-bin/pyrobase.pl?pfam=fer4_NifH   (622 words)

Tao Wang 2004 956 Reconstitution of iron-sulfur cluster in the Sll0088 protein and EPR spectroscopy. The SufR protein harbors an iron-sulfur cluster, as shown by optical absorption and EPR spectroscopy, and the spectra and relaxation properties are consistent with its identification as a [4Fe-4S] cluster. Characterization of genes encoding multi-domain proteins in the genome of the filamentous nitrogen-fixing cyanobacterium Anabaena sp. www.bionewsonline.com /7/k/tao_wang_2004_956.htm   (622 words)

Larry E. Vickery, Ph.D., Publications Identification of proteins predicted to mediate iron sulfur cluster assembly." J. J.J. Silberg, T.L. Tapley, K.G. Hoff, and L.E. Vickery (2004) " Regulation of the HscA ATPase reaction cycle by the cochaperone HscB and the iron-sulfur cluster assembly protein IscU ". Silberg, J.J., Hoff, K.G., Tapley, T.L. and Vickery, L.E. "The Fe/S assembly protein IscU behaves as a substrate for the molecular chaperone Hsc66 from Escherichia coli." J. www.ucihs.uci.edu /pandb/faculty/levpubs.html   (622 words)

Iron-sulfur cluster - Wikipedia, the free encyclopedia The 2 iron, 2 sulfur cluster, consisting of two iron atoms, with two inorganic sulfur atoms found between the irons and acting as bridging ligands. The 4 iron, 4 sulfur cluster, consisting of 4 irons, with 4 inorganic sulfur atoms found between the irons and acting as bridging ligands. Iron-sulfur clusters can be involved in oxidation-reduction reactions, or can be involved in catalysis. en.wikipedia.org /wiki/Iron-sulfur_cluster   (622 words)

iron sulfur protein family of one electron transfer reaction mediators and catalysts whose reactive moiety consists of a cluster of iron and inorganic sulfide liganded to cysteine SH groups. crisp.cit.nih.gov /Thesaurus/00004365.htm   (622 words)

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